Maybe 2 to 2.5 years. The U74 core in the BeagleV and Unmatched was announced October 2018. If not for COVID it probably would have shipped six months ago.
The C906 core in Allwinner D1 SoC will make an excellent competitor to the Pi Zero when it ships on the promised $10 to $15 Sipeed and Pine64 boards later in the year -- and that will be a real price where you can buy as many as you want, not the "$5 but you can only buy one" fake Pi Zero price.
The $99 "Nezha" board with the D1 is of course not value-competitive for that performance level. It's a manufacturer's (i.e. Allwinner) prototype board for volume manufacturers such as Pine64 to use to develop software while they work on their own board.
The same goes for the HiFive Unmatched. It's not intended for volume production, it's for developers to use to prepare software for later high volume boards (including the BeagleV).
The C906 core in Allwinner D1 SoC will make an excellent competitor to the Pi Zero when it ships on the promised $10 to $15 Sipeed and Pine64 boards later in the year -- and that will be a real price where you can buy as many as you want, not the "$5 but you can only buy one" fake Pi Zero price.
The $99 "Nezha" board with the D1 is of course not value-competitive for that performance level. It's a manufacturer's (i.e. Allwinner) prototype board for volume manufacturers such as Pine64 to use to develop software while they work on their own board.
The same goes for the HiFive Unmatched. It's not intended for volume production, it's for developers to use to prepare software for later high volume boards (including the BeagleV).